Chalk this up under "Blogs You Ought to be Following". The Tumblr Fuck Yeah Fluid Dynamics is a great place to find succinct, clear explanations of the forces that make things flow. In particular, they're fantastic at posting explanations behind things you see in YouTube videos, both viral and obscure.

The video above — in which a nice Siberian guy tosses boiling water off his balcony and creates a cloud of snow — has been making the rounds recently. Here's how Fuck Yeah Fluid Dynamics explains it:

Several effects are going on here. The first thing to understand is how heat is transferred between objects or fluids of differing temperatures. The rate at which heat is transferred depends on the temperature difference between the air and the water; the larger that temperature difference is the faster heat is transferred. However, as that temperature difference decreases, so does the rate of heat transfer. So even though hot water will initially lose heat very quickly to its surroundings, water that is initially cold will still reach equilibrium with the cold air faster. Therefore, all things being equal, hot water does not freeze faster than cold water, as one might suspect from the video.

The key to the hot water’s fast-freeze here is not just the large temperature difference, though. It’s the fact that the water is being tossed ...

Authorities in Russia are investigating the legality of a "doll demonstration" demanding "clean elections" in the Siberian city of Barnaul, and looking for the humans responsible.

Russian news agency RIA Novosti reports that Russia's police "[arrest] anyone, young or old, who takes part in an "unsanctioned" opposition rally"—so, some citizens in Barnaul created a protest tableau composed of dolls, instead.

Lego minifigs, South Park ("Team America"?) characters, stuffed dollies, Shreks, gnomes, elves, and Wall-e robots carrying protest placards were placed on an icy ledge in the town's center on January 7 and 14. This act followed police crackdowns on two protests by normal-sized people back in December. The focus of all the protests, large and small? Political corruption, and the results of Russia's parliamentary elections.

Most of the figurines held up little signs affixed to toothpicks with satirical messages on them, such as "146%", in reference to a southern region where state television inadvertently reported a 146 per cent turnout in recent elections. Other toys held caricatures of the Prime Minister, Vladimir Putin, and President Dmitry Medvedev.

The victory of Mr Putin's United Russia Party in last month's parliamentary polls, amid allegations of fraud, brought tens of thousands of protesters onto Moscow's streets. The government seemed to realise it could not take the usual repressive action against the demonstrators in the capital, but in Barnaul authorities "did everything possible" to block protests, Andrei Teslenko, one of the organisers, said.

That's when the activists set up the toy protests. "The authorities are blocking our constitutional rights to peaceful protests, but they haven't yet got as far as limiting the rights of toys," he said.